organic compounds
H-benzo[f]chromene-2-carbonitrile
of 3-amino-1-(4-methoxyphenyl)-1aChemistry and Environmental Division, Manchester Metropolitan University, Manchester M1 5GD, England, bChemistry Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt, cSchool of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, England, dDepartment of Physics, Faculty of Sciences, Erciyes University, 38039 Kayseri, Turkey, eChemistry Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt, and fKirkuk University, College of Science, Department of Chemistry, Kirkuk, Iraq
*Correspondence e-mail: shaabankamel@yahoo.com
In the title compound, C21H16N2O2, the methoxybenzene ring is almost perpendicular to the mean plane of the naphthalene ring system, making a dihedral angle of 83.62 (5)°. The 4H-pyran ring fused with the naphthalene ring system is almost planar [maximum deviation = 0.033 (1) Å]. In the crystal, molecules are linked into inversion dimers by pairs of N—H⋯N hydrogen bonds. N—H⋯O hydrogen bonds connect the dimers, forming a helical supramolecular chain along the a-axis direction. The crystal packing also features C—H⋯π interactions.
Keywords: crystal structure; chromene compounds; benzochromene; hydrogen bonding; C—H⋯π interactions.
CCDC reference: 1405398
1. Related literature
For the biological interest of benzochromene derivatives, see: Gourdeau et al. (2004); Sangani et al. (2012); Cheng et al. (2003); Kamal et al. (2012); Denish et al. (2012); Nitin et al.. (2012); Bhat et al. (2008). For a similar structure, see: Akkurt et al. (2013).
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: CrystalClearSM Expert (Rigaku, 2012); cell CrystalClearSM Expert; data reduction: CrystalClearSM Expert; program(s) used to solve structure: SUPERFLIP (Palatinus & Chapuis, 2007); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: WinGX (Farrugia, 2012).
Supporting information
CCDC reference: 1405398
10.1107/S2056989015011020/hg5445sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S2056989015011020/hg5445Isup2.hkl
Supporting information file. DOI: 10.1107/S2056989015011020/hg5445Isup3.cml
An ethanolic solution of 4-methoxybenzylidenepropanedinitrile (184 mg; 1 mmol) and 2-naphthol (144 mg; 1 mmol) was refluxed with stirring for 3 h at 350 K with adding two drops of piperidine. The solid product was obtained by cooling the reaction mixture to room temperature, then it was collected by filtration, washed with cold ethanol and dried under vacuum. Colourless crystals of the title compound (M.p. 465 K) suitable for X-ray diffraction were obtained in excellent yield (87%) by recrystallization of the crude product from ethanol using the slow evaporation method.
All H atoms attached to C atoms were fixed geometrically and treated as riding with C—H = 0.95 Å (aromatic CH), C—H = 0.98 Å (methyl CH3), C—H = 1.00 Å (methine CH) with Uiso(H) = 1.5Ueq(methyl C) or Uiso(H) = 1.2Ueq(C). The H atoms of the NH2 group were located in difference Fourier maps and included in the subsequent
using restraints (N1—H1B = 0.900 (17) Å and N1—H1A = 0.896 (18) Å) with Uiso(H) = 1.2Ueq(N).Data collection: CrystalClearSM Expert (Rigaku, 2012); cell
CrystalClearSM Expert (Rigaku, 2012); data reduction: CrystalClearSM Expert (Rigaku, 2012); program(s) used to solve structure: SUPERFLIP (Palatinus & Chapuis, 2007); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: WinGX (Farrugia, 2012).Fig. 1. View of the title compound with the atom numbering scheme. Displacement ellipsoids for non-H atoms are drawn at the 50% probability level. | |
Fig. 2. View of the dimers forming by N—H···N hydrogen bonds. |
C21H16N2O2 | F(000) = 1376 |
Mr = 328.36 | Dx = 1.330 Mg m−3 |
Monoclinic, I2/a | Cu Kα radiation, λ = 1.54178 Å |
Hall symbol: -I 2ya | Cell parameters from 15816 reflections |
a = 20.6017 (14) Å | θ = 2.6–68.3° |
b = 6.1461 (4) Å | µ = 0.70 mm−1 |
c = 25.9689 (16) Å | T = 100 K |
β = 94.332 (4)° | Prism, colourless |
V = 3278.8 (4) Å3 | 0.38 × 0.23 × 0.13 mm |
Z = 8 |
Rigaku AFC11 diffractometer | 2914 independent reflections |
Radiation source: Rotating Anode | 2832 reflections with I > 2σ(I) |
Detector resolution: 22.2222 pixels mm-1 | Rint = 0.037 |
profile data from ω–scans | θmax = 68.2°, θmin = 3.4° |
Absorption correction: multi-scan (CrystalClearSM Expert; Rigaku, 2012) | h = −24→24 |
Tmin = 0.910, Tmax = 1.000 | k = −5→7 |
12941 measured reflections | l = −31→24 |
Refinement on F2 | Hydrogen site location: mixed |
Least-squares matrix: full | H atoms treated by a mixture of independent and constrained refinement |
R[F2 > 2σ(F2)] = 0.041 | w = 1/[σ2(Fo2) + (0.0752P)2 + 2.3851P] where P = (Fo2 + 2Fc2)/3 |
wR(F2) = 0.116 | (Δ/σ)max = 0.001 |
S = 1.03 | Δρmax = 0.31 e Å−3 |
2914 reflections | Δρmin = −0.23 e Å−3 |
236 parameters | Extinction correction: SHELXL2014 (Sheldrick, 2015), FC*=KFC[1+0.001XFC2Λ3/SIN(2Θ)]-1/4 |
0 restraints | Extinction coefficient: 0.0014 (2) |
C21H16N2O2 | V = 3278.8 (4) Å3 |
Mr = 328.36 | Z = 8 |
Monoclinic, I2/a | Cu Kα radiation |
a = 20.6017 (14) Å | µ = 0.70 mm−1 |
b = 6.1461 (4) Å | T = 100 K |
c = 25.9689 (16) Å | 0.38 × 0.23 × 0.13 mm |
β = 94.332 (4)° |
Rigaku AFC11 diffractometer | 2914 independent reflections |
Absorption correction: multi-scan (CrystalClearSM Expert; Rigaku, 2012) | 2832 reflections with I > 2σ(I) |
Tmin = 0.910, Tmax = 1.000 | Rint = 0.037 |
12941 measured reflections |
R[F2 > 2σ(F2)] = 0.041 | 0 restraints |
wR(F2) = 0.116 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | Δρmax = 0.31 e Å−3 |
2914 reflections | Δρmin = −0.23 e Å−3 |
236 parameters |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles |
Refinement. Refinement on F2 for ALL reflections except those flagged by the user for potential systematic errors. Weighted R-factors wR and all goodnesses of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The observed criterion of F2 > σ(F2) is used only for calculating -R-factor-obs etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
O1 | 0.46524 (4) | 1.06769 (14) | 0.61312 (3) | 0.0180 (2) | |
O2 | 0.82346 (4) | 0.82919 (15) | 0.54600 (3) | 0.0243 (3) | |
N1 | 0.43089 (5) | 0.85280 (19) | 0.54736 (4) | 0.0229 (3) | |
N2 | 0.54448 (5) | 0.39845 (17) | 0.54907 (4) | 0.0212 (3) | |
C1 | 0.47727 (6) | 0.88455 (19) | 0.58585 (5) | 0.0171 (3) | |
C2 | 0.52947 (6) | 0.75466 (19) | 0.59874 (5) | 0.0172 (3) | |
C3 | 0.58264 (6) | 0.80882 (19) | 0.64036 (4) | 0.0166 (3) | |
C4 | 0.56459 (6) | 1.01315 (19) | 0.66861 (4) | 0.0166 (3) | |
C5 | 0.60414 (6) | 1.0884 (2) | 0.71278 (5) | 0.0184 (3) | |
C6 | 0.65975 (6) | 0.9729 (2) | 0.73361 (5) | 0.0233 (4) | |
C7 | 0.69636 (7) | 1.0479 (3) | 0.77625 (5) | 0.0303 (4) | |
C8 | 0.68002 (7) | 1.2444 (3) | 0.80039 (5) | 0.0301 (4) | |
C9 | 0.62635 (6) | 1.3586 (2) | 0.78173 (5) | 0.0245 (4) | |
C10 | 0.58687 (6) | 1.2843 (2) | 0.73818 (5) | 0.0190 (3) | |
C11 | 0.52962 (6) | 1.39706 (19) | 0.71978 (5) | 0.0189 (3) | |
C12 | 0.49085 (6) | 1.3200 (2) | 0.67886 (5) | 0.0181 (3) | |
C13 | 0.50912 (6) | 1.12794 (19) | 0.65376 (4) | 0.0164 (3) | |
C14 | 0.53658 (5) | 0.5592 (2) | 0.57068 (4) | 0.0170 (3) | |
C15 | 0.64862 (5) | 0.8191 (2) | 0.61700 (4) | 0.0162 (3) | |
C16 | 0.68716 (6) | 0.6343 (2) | 0.61775 (5) | 0.0192 (3) | |
C17 | 0.74603 (6) | 0.6302 (2) | 0.59448 (5) | 0.0204 (3) | |
C18 | 0.76660 (6) | 0.8158 (2) | 0.57027 (5) | 0.0189 (3) | |
C19 | 0.72851 (6) | 1.0035 (2) | 0.56930 (5) | 0.0198 (3) | |
C20 | 0.66979 (6) | 1.0046 (2) | 0.59208 (4) | 0.0180 (3) | |
C21 | 0.85852 (6) | 0.6305 (2) | 0.53986 (6) | 0.0306 (4) | |
H1A | 0.4404 (8) | 0.772 (3) | 0.5202 (7) | 0.031 (4)* | |
H1B | 0.3976 (8) | 0.948 (3) | 0.5451 (6) | 0.028 (4)* | |
H3 | 0.58470 | 0.68680 | 0.66590 | 0.0200* | |
H6 | 0.67180 | 0.84130 | 0.71770 | 0.0280* | |
H7 | 0.73310 | 0.96680 | 0.78970 | 0.0360* | |
H8 | 0.70620 | 1.29690 | 0.82940 | 0.0360* | |
H9 | 0.61530 | 1.49000 | 0.79820 | 0.0290* | |
H11 | 0.51810 | 1.52820 | 0.73620 | 0.0230* | |
H12 | 0.45200 | 1.39460 | 0.66740 | 0.0220* | |
H16 | 0.67320 | 0.50720 | 0.63450 | 0.0230* | |
H17 | 0.77170 | 0.50160 | 0.59520 | 0.0250* | |
H19 | 0.74290 | 1.13120 | 0.55290 | 0.0240* | |
H20 | 0.64380 | 1.13240 | 0.59070 | 0.0220* | |
H21A | 0.83040 | 0.52570 | 0.52050 | 0.0460* | |
H21B | 0.87210 | 0.57030 | 0.57390 | 0.0460* | |
H21C | 0.89700 | 0.65970 | 0.52100 | 0.0460* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0168 (4) | 0.0180 (4) | 0.0191 (4) | 0.0025 (3) | 0.0012 (3) | −0.0031 (3) |
O2 | 0.0162 (4) | 0.0278 (5) | 0.0297 (5) | −0.0001 (4) | 0.0079 (4) | −0.0048 (4) |
N1 | 0.0184 (5) | 0.0256 (6) | 0.0243 (6) | 0.0045 (4) | −0.0010 (4) | −0.0081 (5) |
N2 | 0.0229 (5) | 0.0203 (6) | 0.0204 (5) | 0.0018 (4) | 0.0015 (4) | −0.0013 (4) |
C1 | 0.0171 (6) | 0.0171 (6) | 0.0176 (6) | −0.0016 (4) | 0.0052 (4) | −0.0018 (4) |
C2 | 0.0169 (6) | 0.0171 (6) | 0.0179 (6) | −0.0010 (5) | 0.0039 (4) | −0.0010 (5) |
C3 | 0.0166 (6) | 0.0169 (6) | 0.0163 (6) | −0.0003 (4) | 0.0023 (4) | 0.0006 (5) |
C4 | 0.0167 (6) | 0.0177 (6) | 0.0159 (6) | −0.0012 (5) | 0.0055 (4) | 0.0013 (5) |
C5 | 0.0188 (6) | 0.0204 (6) | 0.0165 (6) | −0.0013 (5) | 0.0049 (5) | 0.0009 (5) |
C6 | 0.0238 (6) | 0.0262 (7) | 0.0199 (6) | 0.0044 (5) | 0.0010 (5) | −0.0027 (5) |
C7 | 0.0255 (7) | 0.0398 (8) | 0.0248 (7) | 0.0073 (6) | −0.0039 (5) | −0.0037 (6) |
C8 | 0.0283 (7) | 0.0398 (8) | 0.0213 (6) | −0.0005 (6) | −0.0041 (5) | −0.0086 (6) |
C9 | 0.0268 (7) | 0.0261 (7) | 0.0210 (6) | −0.0020 (5) | 0.0045 (5) | −0.0057 (5) |
C10 | 0.0209 (6) | 0.0199 (6) | 0.0170 (6) | −0.0026 (5) | 0.0063 (5) | −0.0003 (5) |
C11 | 0.0231 (6) | 0.0164 (6) | 0.0180 (6) | −0.0017 (5) | 0.0078 (5) | −0.0003 (5) |
C12 | 0.0183 (6) | 0.0179 (6) | 0.0188 (6) | 0.0010 (5) | 0.0062 (5) | 0.0025 (5) |
C13 | 0.0170 (6) | 0.0183 (6) | 0.0143 (5) | −0.0022 (4) | 0.0038 (4) | 0.0015 (4) |
C14 | 0.0156 (6) | 0.0197 (6) | 0.0160 (6) | −0.0003 (4) | 0.0024 (4) | 0.0019 (5) |
C15 | 0.0149 (6) | 0.0189 (6) | 0.0146 (5) | −0.0004 (4) | −0.0001 (4) | −0.0024 (4) |
C16 | 0.0199 (6) | 0.0165 (6) | 0.0213 (6) | 0.0000 (5) | 0.0015 (5) | 0.0007 (5) |
C17 | 0.0178 (6) | 0.0194 (6) | 0.0240 (6) | 0.0046 (5) | 0.0008 (5) | −0.0031 (5) |
C18 | 0.0139 (5) | 0.0257 (6) | 0.0172 (6) | −0.0013 (5) | 0.0019 (4) | −0.0053 (5) |
C19 | 0.0213 (6) | 0.0181 (6) | 0.0203 (6) | −0.0025 (5) | 0.0031 (5) | 0.0001 (5) |
C20 | 0.0185 (6) | 0.0163 (6) | 0.0192 (6) | 0.0022 (4) | 0.0016 (4) | −0.0016 (5) |
C21 | 0.0197 (6) | 0.0321 (8) | 0.0410 (8) | 0.0025 (5) | 0.0089 (6) | −0.0137 (6) |
O1—C1 | 1.3625 (15) | C11—C12 | 1.3650 (18) |
O1—C13 | 1.3871 (14) | C12—C13 | 1.4132 (17) |
O2—C18 | 1.3740 (15) | C15—C20 | 1.3970 (17) |
O2—C21 | 1.4338 (15) | C15—C16 | 1.3851 (17) |
N1—C1 | 1.3438 (16) | C16—C17 | 1.3955 (18) |
N2—C14 | 1.1538 (16) | C17—C18 | 1.3843 (18) |
C1—C2 | 1.3607 (17) | C18—C19 | 1.3944 (17) |
N1—H1B | 0.900 (17) | C19—C20 | 1.3862 (17) |
N1—H1A | 0.896 (18) | C3—H3 | 1.0000 |
C2—C14 | 1.4184 (17) | C6—H6 | 0.9500 |
C2—C3 | 1.5166 (17) | C7—H7 | 0.9500 |
C3—C4 | 1.5149 (16) | C8—H8 | 0.9500 |
C3—C15 | 1.5311 (16) | C9—H9 | 0.9500 |
C4—C13 | 1.3733 (17) | C11—H11 | 0.9500 |
C4—C5 | 1.4326 (17) | C12—H12 | 0.9500 |
C5—C10 | 1.4307 (18) | C16—H16 | 0.9500 |
C5—C6 | 1.4197 (18) | C17—H17 | 0.9500 |
C6—C7 | 1.3716 (19) | C19—H19 | 0.9500 |
C7—C8 | 1.413 (2) | C20—H20 | 0.9500 |
C8—C9 | 1.367 (2) | C21—H21A | 0.9800 |
C9—C10 | 1.4178 (18) | C21—H21B | 0.9800 |
C10—C11 | 1.4194 (18) | C21—H21C | 0.9800 |
C1—O1—C13 | 118.84 (9) | C15—C16—C17 | 121.65 (11) |
C18—O2—C21 | 117.01 (10) | C16—C17—C18 | 119.19 (11) |
O1—C1—N1 | 111.07 (10) | O2—C18—C19 | 116.12 (11) |
O1—C1—C2 | 121.89 (11) | O2—C18—C17 | 123.96 (11) |
N1—C1—C2 | 127.02 (12) | C17—C18—C19 | 119.92 (12) |
H1A—N1—H1B | 121.3 (15) | C18—C19—C20 | 120.29 (11) |
C1—N1—H1A | 118.7 (11) | C15—C20—C19 | 120.45 (11) |
C1—N1—H1B | 116.7 (11) | C2—C3—H3 | 107.00 |
C1—C2—C3 | 124.15 (11) | C4—C3—H3 | 107.00 |
C1—C2—C14 | 118.75 (11) | C15—C3—H3 | 107.00 |
C3—C2—C14 | 117.06 (10) | C5—C6—H6 | 119.00 |
C2—C3—C4 | 109.67 (10) | C7—C6—H6 | 119.00 |
C4—C3—C15 | 114.55 (10) | C6—C7—H7 | 120.00 |
C2—C3—C15 | 109.98 (9) | C8—C7—H7 | 120.00 |
C5—C4—C13 | 118.03 (10) | C7—C8—H8 | 120.00 |
C3—C4—C5 | 120.65 (10) | C9—C8—H8 | 120.00 |
C3—C4—C13 | 121.29 (10) | C8—C9—H9 | 119.00 |
C4—C5—C6 | 122.51 (11) | C10—C9—H9 | 119.00 |
C4—C5—C10 | 119.65 (11) | C10—C11—H11 | 119.00 |
C6—C5—C10 | 117.83 (11) | C12—C11—H11 | 119.00 |
C5—C6—C7 | 121.22 (12) | C11—C12—H12 | 120.00 |
C6—C7—C8 | 120.70 (13) | C13—C12—H12 | 120.00 |
C7—C8—C9 | 119.67 (13) | C15—C16—H16 | 119.00 |
C8—C9—C10 | 121.15 (12) | C17—C16—H16 | 119.00 |
C5—C10—C9 | 119.42 (11) | C16—C17—H17 | 120.00 |
C5—C10—C11 | 119.01 (11) | C18—C17—H17 | 120.00 |
C9—C10—C11 | 121.56 (11) | C18—C19—H19 | 120.00 |
C10—C11—C12 | 121.01 (11) | C20—C19—H19 | 120.00 |
C11—C12—C13 | 119.23 (11) | C15—C20—H20 | 120.00 |
C4—C13—C12 | 123.00 (11) | C19—C20—H20 | 120.00 |
O1—C13—C12 | 113.14 (10) | O2—C21—H21A | 109.00 |
O1—C13—C4 | 123.86 (10) | O2—C21—H21B | 109.00 |
N2—C14—C2 | 177.37 (12) | O2—C21—H21C | 109.00 |
C3—C15—C16 | 119.06 (10) | H21A—C21—H21B | 109.00 |
C3—C15—C20 | 122.33 (10) | H21A—C21—H21C | 109.00 |
C16—C15—C20 | 118.49 (10) | H21B—C21—H21C | 109.00 |
C13—O1—C1—N1 | −178.67 (10) | C5—C4—C13—O1 | −177.22 (10) |
C13—O1—C1—C2 | 2.86 (17) | C5—C4—C13—C12 | 2.37 (18) |
C1—O1—C13—C4 | −0.19 (16) | C4—C5—C6—C7 | −179.38 (13) |
C1—O1—C13—C12 | −179.81 (10) | C10—C5—C6—C7 | −0.91 (19) |
C21—O2—C18—C17 | 8.50 (17) | C4—C5—C10—C9 | −179.71 (11) |
C21—O2—C18—C19 | −171.07 (11) | C4—C5—C10—C11 | 1.72 (18) |
O1—C1—C2—C3 | −6.34 (19) | C6—C5—C10—C9 | 1.78 (18) |
O1—C1—C2—C14 | 175.95 (11) | C6—C5—C10—C11 | −176.80 (12) |
N1—C1—C2—C3 | 175.45 (12) | C5—C6—C7—C8 | −0.7 (2) |
N1—C1—C2—C14 | −2.3 (2) | C6—C7—C8—C9 | 1.4 (2) |
C1—C2—C3—C4 | 6.28 (16) | C7—C8—C9—C10 | −0.5 (2) |
C1—C2—C3—C15 | −120.55 (13) | C8—C9—C10—C5 | −1.10 (19) |
C14—C2—C3—C4 | −175.97 (10) | C8—C9—C10—C11 | 177.44 (13) |
C14—C2—C3—C15 | 57.20 (14) | C5—C10—C11—C12 | 0.73 (19) |
C2—C3—C4—C5 | 174.52 (11) | C9—C10—C11—C12 | −177.82 (12) |
C2—C3—C4—C13 | −3.53 (15) | C10—C11—C12—C13 | −1.63 (19) |
C15—C3—C4—C5 | −61.27 (14) | C11—C12—C13—O1 | 179.67 (11) |
C15—C3—C4—C13 | 120.68 (12) | C11—C12—C13—C4 | 0.03 (19) |
C2—C3—C15—C16 | −93.24 (12) | C3—C15—C16—C17 | 176.32 (11) |
C2—C3—C15—C20 | 82.78 (13) | C20—C15—C16—C17 | 0.14 (18) |
C4—C3—C15—C16 | 142.72 (11) | C3—C15—C20—C19 | −176.89 (10) |
C4—C3—C15—C20 | −41.26 (14) | C16—C15—C20—C19 | −0.85 (17) |
C3—C4—C5—C6 | −2.87 (18) | C15—C16—C17—C18 | 0.34 (19) |
C3—C4—C5—C10 | 178.69 (11) | C16—C17—C18—O2 | −179.67 (11) |
C13—C4—C5—C6 | 175.25 (12) | C16—C17—C18—C19 | −0.12 (19) |
C13—C4—C5—C10 | −3.20 (17) | O2—C18—C19—C20 | 179.00 (11) |
C3—C4—C13—O1 | 0.88 (17) | C17—C18—C19—C20 | −0.59 (19) |
C3—C4—C13—C12 | −179.53 (11) | C18—C19—C20—C15 | 1.08 (18) |
Cg2 is the centroid of the C4/C5/C10–C13 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···N2i | 0.896 (18) | 2.125 (18) | 3.0174 (15) | 173.8 (16) |
N1—H1B···O2ii | 0.900 (17) | 2.053 (17) | 2.9509 (14) | 175.5 (14) |
C11—H11···Cg2iii | 0.95 | 2.56 | 3.3913 (14) | 147 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x−1/2, −y+2, z; (iii) −x+1, y+1/2, −z+3/2. |
Cg2 is the centroid of the C4/C5/C10–C13 ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1A···N2i | 0.896 (18) | 2.125 (18) | 3.0174 (15) | 173.8 (16) |
N1—H1B···O2ii | 0.900 (17) | 2.053 (17) | 2.9509 (14) | 175.5 (14) |
C11—H11···Cg2iii | 0.95 | 2.56 | 3.3913 (14) | 147 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x−1/2, −y+2, z; (iii) −x+1, y+1/2, −z+3/2. |
Acknowledgements
The authors would like to express their thanks to the National Crystallography Service (NCS), Southampton, UK, for providing the X-ray data.
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Benzopyran (Chromene) is one of the important medicinal pharmacophores found in natural compounds which generated great attention because of their interesting biological activity. The natural and synthetic chromene derivatives have important biological activities such as antivascular (Gourdeau et al., 2004), antimicrobial (Sangani et al., 2012), TNF-α inhibitor (Cheng et al., 2003), anticancer (Kamal et al., 2012), anti-HIV (Denish et al., 2012), anti-inflammatory (Nitin et al., 2012), and anticonvulsant activity (Bhat et al., 2008). Based on such findings and following to our study on synthesis of bio-active heterocyclic molecules we herein report the synthesis and crystal structure of the title compound.
Fig. 1 shows the asymmetric unit of the title compound. The methoxybenzene ring (C15–C20) is approximately perpendicular to the naphthalene ring system [C4–C13, maximum deviation = 0.040 (1) Å at atom C12] as indicated by the dihedral angle of 83.62 (5)°. The pyran ring (O1/C1–C4/C13) is almost planar [maximum deviation = -0.033 (1) Å at atom C2]. The methoxy group (C21/O2) is nearly co-planar with the attached benzene ring (C15–C20) with the torsion angle C21—O2—C18—C19 of -171.07 (11)°. The bond lengths and angles in the title compound are within normal ranges and comparable with those reported for a similar structure (Akkurt et al., 2013).
In the crystal, molecules are linked into a helical supramolecular chain along the a axis, which consist of N1—H1B···O2 hydrogen bonds that connect the dimers formed by N1—H1A···N2 hydrogen bonds, to each other (Fig. 2). The crystal packing is further stabilized by C—H···π interactions (Table 1).